scholarly journals RESEARCH ON TOXICITY EVALUATION OF WASTE INCINERATION RESIDUES OF PRINTED CIRCUIT BOARDS / ELEKTRONIKOS PLOKŠČIŲ PELENŲ TYRIMAI IR JŲ PAVOJINGUMO VERTINIMAS

2014 ◽  
Vol 6 (4) ◽  
pp. 400-406 ◽  
Author(s):  
Rasa Volungevičienė ◽  
Violeta Bolutienė ◽  
Kęstutis Buinevičius
Keyword(s):  
Printed Circuit Boards ◽  
Waste Incineration ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Different Temperatures ◽  
Treatment Technologies ◽  
Incineration Residues ◽  
Incineration Residue ◽  
Residual Ash

Recycling waste printed circuit boards (PCB) is an extremely complicated process, because PCBs consist of a number of complex components – hazardous and non-hazardous materials sets. Pyrolysis and combustion are currently the most effective treatment technologies for waste printed circuit boards. Pyrolysis can be used for thermally decomposing PCBs allowing for the simultaneous recovery of valuable materials. Following the extraction of valuable materials, the problem of residual ash utilization is encountered. Determining the qualitative and quantitative characteristics of incineration residue helps with choosing effective ash management technologies. This paper analyzes PCB ash generated at three different temperatures of 400 °C, 500 °C and 600 °C. Ash residues have been analysed to determine the quantity and type of metals present. Furthermore, the experiment of leaching heavy metals from ash has been described. Nebenaudojamoje elektroninėje įrangoje esančių montažinių plokščių (elektronikos plokščių) perdirbimas yra itin komplikuotas procesas, nes jos sudarytos iš daugybės kompleksinių komponentų – pavojingųjų ir nepavojingųjų medžiagų rinkinių. Pirolizė ir deginimas – šiuo metu vienos efektyviausių elektronikos plokščių apdorojimo technologijų ekonominiu ir aplinkosaugos požiūriu. Gauti elektronikos plokščių pelenai toliau naudojami vertingoms medžiagoms išgauti. Išgavus vertingas medžiagas, susiduriama su likusių pelenų naudojimo problema. Tik žinant susidariusių pelenų kokybines ir kiekybines charakteristikas galima parinkti efektyvias pelenų tvarkymo technologijas. Šiame darbe analizuojami televizorių ir kitų namų ūkių prietaisų elektronikos plokščių pelenai, kurie gauti elektronikos plokštes deginant trijose skirtingose temperatūrose: 400 °C, 500 °C ir 600 °C. Įvertinama, kiek pavojingi elektronikos plokščių pelenai. Šiame darbe taip pat atliekamas geležies, mangano, švino, chromo, vario ir cinko išplovimo iš pelenų eksperimentas, siekiant nustatyti galimą metalų išsiplovimą šalinant pelenus sąvartynuose arba jiems patekus į aplinką įvykus avarijoms.

LEACHING OF METALS FROM WASTE PRINTED CIRCUIT BOARDS (WPCBs) USING SULFURIC AND NITRIC ACIDS

2014 ◽  
Vol 13 (10) ◽  
pp. 2601-2607 ◽  
Author(s):  
Jae-chun Lee ◽  
Manoj Kumar ◽  
Min-Seuk Kim ◽  
Jinki Jeong ◽  
Kyoungkeun Yoo
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

scholarly journals Effective Recovery Process of Copper from Waste Printed Circuit Boards Utilizing Recycling of Leachate

JOM ◽  
2020 ◽  
Author(s):  
Joona Rajahalme ◽  
Siiri Perämäki ◽  
Roshan Budhathoki ◽  
Ari Väisänen
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Printed Circuit Boards ◽  
Sulfuric Acid Concentration ◽  
Recovery Process ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Acid Consumption

AbstractThis study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. Optimum leaching conditions for copper were found by using 3.6 mol L−1 sulfuric acid, 6 vol.% hydrogen peroxide, pulp density of 75 g L−1 with 186 min leaching time at 20°C resulting in complete leaching of copper followed by over 92% recovery and purity of 99.9% in the electrowinning. Study of chemical consumption showed total decomposition of hydrogen peroxide during leaching, while changes in sulfuric acid concentration were minor. During recirculation of the leachate with up to 5 cycles, copper recovery and product purity remained at high levels while acid consumption was reduced by 60%.

scholarly journals Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route

2021 ◽  
Vol 9 (5) ◽  
pp. 895
Author(s):  
Carlotta Alias ◽  
Daniela Bulgari ◽  
Fabjola Bilo ◽  
Laura Borgese ◽  
Alessandra Gianoncelli ◽  
...  
Keyword(s):  
Solid State ◽  
Aspergillus Niger ◽  
Food Waste ◽  
Solid State Fermentation ◽  
Printed Circuit Boards ◽  
Electronic Waste ◽  
Metal Extraction ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

A low-energy paradigm was adopted for sustainable, affordable, and effective urban waste valorization. Here a new, eco-designed, solid-state fermentation process is presented to obtain some useful bio-products by recycling of different wastes. Urban food waste and scraps from trimmings were used as a substrate for the production of citric acid (CA) by solid state fermentation of Aspergillus niger NRRL 334, with a yield of 20.50 mg of CA per gram of substrate. The acid solution was used to extract metals from waste printed circuit boards (WPCBs), one of the most common electronic waste. The leaching activity of the biological solution is comparable to a commercial CA one. Sn and Fe were the most leached metals (404.09 and 67.99 mg/L, respectively), followed by Ni and Zn (4.55 and 1.92 mg/L) without any pre-treatments as usually performed. Commercial CA extracted Fe more efficiently than the organic one (123.46 vs. 67.99 mg/L); vice versa, biological organic CA recovered Ni better than commercial CA (4.55 vs. 1.54 mg/L). This is the first approach that allows the extraction of metals from WPCBs through CA produced by A. niger directly grown on waste material without any sugar supplement. This “green” process could be an alternative for the recovery of valuable metals such as Fe, Pb, and Ni from electronic waste.

Physical pre-concentration and ammonium leaching of metal copper from waste printed circuit boards

2021 ◽  
pp. 128512
Author(s):  
Shun-xiang Shi ◽  
Chun-chen Nie ◽  
Hong-hao Chang ◽  
Peng Wu ◽  
Zheng-jie Piao ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards
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